Ian Lance Taylor <iant@xxxxxxxxxx> writes: > Read about the key method and type_info objects here: > > http://gcc.gnu.org/onlinedocs/gcc/Vague-Linkage.html > > I won't go into all the details, but basically if you mix -frtti and > -fno-rtti code you need to ensure that any classes created in the > -frtti code have their key method compiled with -frtti. Thank you for your report. As I understand B key method is auto generated ~B() and compiler creates it in main compilation unit with type_info object. Even this object never been used compiler creates it anyway. Right? So type_info for B needs type_info for A and ask linker to find it. Linker can't find it, because A key method and vtable was created with -fno-rtti. And the last question: does the type_info object for B really need in main.cpp or compiler creates it just in case?
